public static void formatDoubleFast()

in src/main/java/org/apache/xmlgraphics/util/DoubleFormatUtil.java [279:330]
41 lines of code
14 McCabe index (conditional complexity)

    public static void formatDoubleFast(double source, int decimals, int precision, StringBuffer target) {
        if (isRoundedToZero(source, decimals, precision)) {
            // Will always be rounded to 0
            target.append('0');
            return;
        } else if (Double.isNaN(source) || Double.isInfinite(source)) {
            // Cannot be formated
            target.append(Double.toString(source));
            return;
        }

        boolean isPositive = source >= 0.0;
        source = Math.abs(source);
        int scale = (source >= 1.0) ? decimals : precision;

        long intPart = (long) Math.floor(source);
        double tenScale = tenPowDouble(scale);
        double fracUnroundedPart = (source - intPart) * tenScale;
        long fracPart = Math.round(fracUnroundedPart);
        if (fracPart >= tenScale) {
            intPart++;
            fracPart = Math.round(fracPart - tenScale);
        }
        if (fracPart != 0L) {
            // Remove trailing zeroes
            while (fracPart % 10L == 0L) {
                fracPart = fracPart / 10L;
                scale--;
            }
        }

        if (intPart != 0L || fracPart != 0L) {
            // non-zero value
            if (!isPositive) {
                // negative value, insert sign
                target.append('-');
            }
            // append integer part
            target.append(intPart);
            if (fracPart != 0L) {
                // append fractional part
                target.append('.');
                // insert leading zeroes
                while (scale > 0 && fracPart < tenPowDouble(--scale)) {
                    target.append('0');
                }
                target.append(fracPart);
            }
        } else {
            target.append('0');
        }
    }